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B
Restriction endonucleases
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C
Restriction exonucleases
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D
Polymerases
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Solution
The correct option is C Restriction endonucleases A restriction enzyme (or restriction endonuclease) is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites. The different restriction endonucleases are classified into four different restriction types I, II, III and IV. BamHI, EcoRI, SmaI are the examples of restriction endonucleases which are used in genetic engineering techniques for cleavage of the desired gene and the bacterial plasmid.